Effect of substrate polarity on photocatalytic activity of titanium dioxide particles embedded in mesoporous silica

Shiraishi, Yasuhiro; Sugano, Yoshitsune; Inoue, Daisuke; Hirai, Takayuki

doi:10.1016/j.jcat.2009.04.001

Cited by 31 publications

(25 citation statements)

References 50 publications

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“…Applying this basic concept may help enable phenol production in an economically-and environmentallyfriendly way. Similar adsorption-driven photocatalytic activity is observed by TiO2 particles embedded in mesoporous silica particles, which are prepared by surfactant-templating method with a TiO2 colloidal suspension 13) . The phenol selectivity depends strongly on the amount and size of TiO2 particles embedded.…”

Section: Porous Tio2 Photocatalystssupporting

confidence: 58%

Titanium Oxide-based Photocatalysts for Selective Organic Transformations

Shiraishi

Hirai

2012

J. Jpn. Petrol. Inst.

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Section: Porous Tio2 Photocatalystssupporting

confidence: 58%

Titanium Oxide-based Photocatalysts for Selective Organic Transformations

Shiraishi

Hirai

2012

J. Jpn. Petrol. Inst.

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“…Shiraishi et al described the synthesis of TiO 2 particles embedded in mesoporous silica by a surfactant-templating method starting from a TiO 2 colloidal suspension. [109] The final core-shell structures contained mesopores with widths of 2-5 nm and TiO 2 cores of about 160-170 nm. The photocatalytic activity of theses materials towards several kinds of aromatic molecules in water showed a dependence on the polarity of the reactants, with higher conversions obtained for less polar compounds (i.e., benzene).…”

Section: Nickelmentioning

confidence: 99%

Embedded Phases: A Way to Active and Stable Catalysts

et al. 2010

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Industrial catalysts are typically made of nanosized metal particles, carried by a solid support. The extremely small size of the particles maximizes the surface area exposed to the reactant, leading to higher reactivity. Moreover, the higher the number of metal atoms in contact with the support, the better the catalyst performance. In addition, peculiar properties have been observed for some metal/metal oxide particles of critical sizes. However, thermal stability of these nanostructures is limited by their size; smaller the particle size, the lower the thermal stability. The ability to fabricate and control the structure of nanoparticles allows to influence the resulting properties and, ultimately, to design stable catalysts with the desired characteristics. Tuning particle sizes provides the possibility to modulate the catalytic activity. Unique and unexpected properties have been observed by confining/embedding metal nanoparticles in inorganic channels or cavities, which indeed offers new opportunities for the design of advanced catalytic sytems. Innovation in catalyst design is a powerful tool in realizing the goals of more green, efficient and sustainable industrial processes. The present Review focuses on the catalytic performance of noble metal‐ and non precious metal‐based embedded catalysts with respect to traditional impregnated systems. Emphasis is dedicated to the improved thermal stability of these nanostructures compared to conventional systems.

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“…Thus for photocatalytic application, TiO 2 has been modified into a layer of film or immobilized on inorganic materials such as zeolite (Wijaya et al, 2006), silica (Shiraishi et al, 2009), resins (Wahyuni et al, 2010), activated carbon (Andayani and Sumartono, 2007) and glass fiber (Pandiangan and Simanjuntak, 2013), as well as organic material such as polyurethane (Burgess, 2007) and chitosan (Chen et al, 2010;Qian et al, 2011;Zainal et al, 2009;Nawi et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

The Effect of pH and Aging Time on the Synthesis of TiO2 – Chitosan Nanocomposites as Photocatalyst by Sol-Gel Method at Room Temperature

Fajriati

Mudasir

Wahyuni

2017

Molekul

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The synthesis of TiO 2 -chitosan nanocomposite photocatalyst using Titanium(IV)-Isopropoxide (TTIP) as precursors and chitosan as host material has been conducted. The synthesis was carried out using a sol-gel method at room temperature and aging to grow crystal seeds and generate nanoparticles. The success of forming nano-sized anatase phase TiO 2 nanocrystal was strongly influenced by the sol pH system during hydrolysis and the aging time. The effect of sol pH system and aging time to the crystallinity level and particle size were examined using X-Ray Diffraction (XRD), Transmission Electron Microscopy (TEM) and Diffuse Reflectance UV-Spectroscopy (DR-UV). The results showed that TiO 2 produced in acidic pHs (pH 2-4) tended to have higher crystallinity level than that produced in weakly alkaline (pH > 6), which prone to be amorphous. The longer aging time (> 14 days) also tended to produce the amorphous phase. Furthermore, chitosan as a host material had a notable influence in determining the crystallinity level and particle size of TiO 2 in TiO 2 -chitosan nanocomposite.

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Effect of substrate polarity on photocatalytic activity of titanium dioxide particles embedded in mesoporous silica

Cited by 31 publications

References 50 publications

Titanium Oxide-based Photocatalysts for Selective Organic Transformations

Titanium Oxide-based Photocatalysts for Selective Organic Transformations

Embedded Phases: A Way to Active and Stable Catalysts

The Effect of pH and Aging Time on the Synthesis of TiO2 – Chitosan Nanocomposites as Photocatalyst by Sol-Gel Method at Room Temperature

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